Momentum and Impulse Review

If the momentum of an object changes and its mass remains constant ,

• its velocity is changing

• there is a force acting on it

• it is accelerating

• all of the above

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When you jump you bend your knees to land the time increases by 10x which reduces the force

• by less than 10 times

• by about 10 times

• by greater than 10x

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The momentum change of an object is equal to the

• impulse acting on it

• objects mass times the force acting on it

• force acting on it

• force acting on it times its velocity

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A car traveling along the road needs a force to stop more force is required when the car has

• less stopping distance

• more momentum

• more mass

• all of these

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Which of the following has the largest momentum

• a large truck parked a parking lot

• a pickup truck traveling down the highway

• the science building at your school

• a dog running down the street

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A collision is considered elastic if

• the objects dont stick together

• the objects that collide dont get warmer

• there is no lasting deformation

• all of these

a ball player moves his hand backward to catch a ball this reduces the force on the hand by

• decreasing the time of impact

• by applying a force

• increasing the time of impact

• none of these

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the reason padded dashboards are used in cars is that they _________

• increase the time of impact

• decreases the time of impact

• applies a force

• increases the impulse

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A girl is standing on a frictionless pond what can she do to get off the ice

• throw an object in the direction she wants to go

• throw an object in the opposite direction she wants to go

• scream for help

• give up she dead dead

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What does the law of conservation of momentum state

• the total momentum is equal to impulse

• the change in the momentum is equal to impulse

• there is no law of conservation of momentum

• the total momentum in an isolated system is conserved

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